To reply the thread question:
Definitely ML feels snappier then Lion. It is a still a beta, there are some bugs, but from testing in last few weeks, it works very well.
I must say that I am happy with the safari 6, which is now my main browser after long time using Chrome. Will he be the snappiest OS it is still unknown, will see after few updates and public release. Even SL needed some time. But it has a good starting point.
To latest hardware/software support discussion:
First of all, off course, newer is always better there is no question about it, but hey guys, machines from few years back are still some good machines to do with. Big percentage of users only do some normal basic stuff, which include browsing, office and things like that. Dunno if its the best comparison but I still have some c2d desktop win machine from late 2007, and it works just great. Win 8 works fluid, programs work just fine, and I still believe it will for quite some time. So, I do think Apple should be more supportive to older machines. At least for OS supports. Not everyone can purchase new ones after just year or two, and for normal usage dont even see the point. Reasonable things are to upgrade ram, and SSD, but for me complete new computer for just 15% boost isnt profitable. But okey thats just me, respect those which is, just think Apple should have in mind to users with older machines.